Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 436,410	$ 448,690
Less: accumulated depreciation	314,949	324,521
Property and equipment, net	121,461	124,169
Capitalized software costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	218,209	200,567
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17,474	22,785
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	38,529	41,573
Computer and communications equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 162,198	$ 183,765